Thanks Jack. Heathrow is not always short of seagulls either. I will post a photo of an Air Canada 787 surrounded by seagulls later. As this approached, a flock of seagulls barged in. Normally, I would wait a second or two then get another shot. On this occasion, the seagulls were quickly replaced by a horde of rooks, chasing the seagulls. No manners at all, these birds!